49
12.1
Ratings and Capacities
• Constructed and hydrostatically tested for maximum
allowable working pressure of 150 psig (pounds per square
inch gauge) (345 kPa) in accordance with ASME Boiler and
Pressure Vessel Code, Section IV, Rules for Construction of
Heating Boilers.
• Ratings use for elevations up to 2000 ft (600m) above sea
level. (Table 14)
• For elevations between 2000 ft (600m) and 4500 ft
(1350m), install high altitude control kit
• For elevations above 4500 ft (1350m) install high altitude
control kit and :
• USA - Reduce input rate 4% for each 1000 ft (300m)
beyond 4500 ft.
TABLE 14: SEA LEVEL RATINGS
NATURAL AND PROPANE GASES
Size
Boiler Input Rate (MBH)
(1)
Heating Capacity
(MBH)
(1)(2)
Net AHRI Rating,
Water (MBH)
(1)(3)
AFUE
(2)
Maximum
Minimum
050
50
10
46
40
95.0
075
75
15
69
60
95.0
100
100
20
91
79
95.0
150
150
30
139
121
95.0
200
200
40
185
161
95.0
299
299
60
273
237
95.0
(1)
1000
Btu/hr (British Thermal Units Per Hour)
(2)
Heating Capacity and AFUE (Annual Fuel Utilization Efficiency) are based on DOE (Department of Energy) test
procedures.
(3)
Net AHRI Ratings based on piping and pickup allowance of 1.15. Contact Technical Support before selecting boiler for
installations having unusual piping and pickup requirements, such as intermittent system operation, extensive piping systems,
etc.
12 - RATINGS AND CAPACITIES
PN 240011320 Rev. G 10/01/2021]
